Concrete-mold.



W. B. WELDON.

CONCRETE MOLD.

APPLICATION rum) SEPT. 4, 1901.

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W. B. WELDON.

CONCRETE MOLD.

APPLICATION TILED SEPT.4,190'1.

2 SHEETS-SHEET 2.

Patented Nov. 17, 1908.

IN VENTOR Williamfl. Wcldon A TTORNE Y WILLIAM B. WELDON, OF CHICAGO,ILLINOIS.

CONCRETE-MOLD.

Specification of Letters Patent.

Patented Nov. 17', 1908.

Application filed September 4, 1907. Serial No. 391,350.

To'all whom it may concern:

5 and 4. Although I have illustrated Be it known that I, VVILLIAM B.VVELDON, 9 four such members, it is to be understood a citizen of theUnited States, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in ConcreteMolds, of which the following is a specification.

My invention relates to concrete molds and has particular reference tomolds for hollow concrete masonry construction.

The objects of my invention are, to provide an improved collapsible moldfor hollow concrete masonry construction such as arches, conduits,sewers and the like, which shall be of great strength and durability andof light construction; to provide a mold as mentioned, which shalloccupy a minimum amount of space in the conduit or arch, and which canbe readily and quickly collapsed to remove from the masonry when thelatter is set, and as quickly expanded and rigidly se cured for furtheruse.

Other objects will appear hereinafter.

With these objects in view my invention consists generally in a shellformed of a plurality of sections extending longitudinally of the deviceand curved or otherwise shaped to conform to the cross section of thearch or conduit to be formed and a suitable folding frame work made insections to conform to the sections of the shell and secured thereto,said frame sections being pivotally connected, and means for rigidlyfixing said frame members in relation to each other.

My invention further consists in various details of construction andarrangements of parts all as will be hereinafter fully described andparticularly pointed out in the claims.

My invention will be more readily understood by reference to theaccompanying drawings forming a part of this specification and in which,

Figure 1 is an end view of a concrete mold' embodying my invention inits preferred form, the same being expanded and secured in position foruse, Fig. 2 is a similar view illustrating the mold partially folded.Fig. 3 is a section on the line a'a: of Fig. 1 and taken substantiallymidway of the length of the mold, and Fig. 4 is a detail section, uponan enlarged scale, upon the line g y of Fig. 1.

Referring to the drawings, it will be seen that the shell of the mold isformed of a plurality of parallel longitudinal members,

that any desired number may be used according to the class of work underconstruction, without departing from the scope of my invention. Forconvenience of description, I will designate the members 1 and 3 as topand bottom members respectively and the members 2 and a as side members,although it is obvious that their relative position when in use may bereversed. The shell members 1 to 4 are shaped transversely to conform tothe cross section of the arch or conduit to be formed. In the drawings,I have illustrated a mold of circular shape.

Each shell member is provided with a plurality of frame members to giverigidity thereto. The frame members extend transversely of the shellmembers and may be of any desired number according to the length of themold. and character of work to be done. I find it most convenient forobvious reasons to make the mold comparatively short and provide thesame with three frame sections, one at each end and one midway of itslength. It is obvious that the shell and the frame members may be formedof any suitable material but I. prefer to make them of metal for variousreasons. When formed of metal, as is illustrated in the drawings, theframe members are preferably formed of angle irons.

55 indicate the frame members secured to the shell members 2 and 4; and66 the frame members secured to the members 1 and 3. The members 5 aresubstantially equal in length to the width of their respective shellmembers and are secured thereto by a plurality of rivets or bolts, 7.The frame members, 6, are secured as by bolts or rivets, S to theirrespective shell members, 1 and 3 and extend beyond the edges of theshell members to overlap the adjacent end of the frame members, Themembers, 5 and 6 are arranged with their base flanges 5, 6 extending inopposite directions in order that the tension flanges 5", 6 may bereadily fastened together as by the bolts, 9, extending through theholes, 10 in the ends of said flanges. To give ample rigidity to thestructure without having recourse to cross braces, I provide each jointwith two bolts, 9; and to close the cracks between the longitudinalshell members, I provide the battens, 11 secured to the members, 2 and 4by rivet-s or bolts, 12.

opposite end of said members.

When the device is set up or expanded for use, as illustrated in Fig. 1it forms a strong rigid mold and the interior thereof is unobstructedexcept for the comparatively small annular frame work formed of themembers, 5 and 6. After the masonry is sufliciently set, the bolt-s, 9are removed from one end of the frame which supports the top portion, 1and also the inner bolts, 9 at the This leaves the top portion free toswing inwardly upon the bolts, 9 as a pivot, after which the mold isreadily removed.

Having described my invention what I claim as new and desire to secureby Letters Patent is:

1. In a device of the class described, a plurality of longitudinal shellmembers transversely shaped to conform to the arch or conduit to bemade, in combination with a plurality of transverse frame membersconforming to said shell members and secured thereto, the ends of saidframe members upon adjacent shell members being arranged to overlap andhaving a plurality of registering bolt holes therein, bolts arranged insaid holes and longitudinally arranged battens closingthe oints betweensaid shell members when the device is expanded as and for the purposespecified.

2. A mold for concrete construction comprising a plurality oflongitudinal shell members transversely shaped to conform to the arch orconduit to be made, in combination with a plurality of transverse framemembers conforming to said, shell members and secured thereto, the endsof said frame members upon adjacent shell members being arranged tooverlap, a pair of bolts extending through the overlapping ends, one ofsaid bolts constituting a hinge pin upon which the adjacent sectionsswing and the other constituting a lock to hold the device in extendedposition, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM B. WELDON.

Witnesses F. E. Si-IEEHY, HELEN F. LILLIs.

